st: -tpm- : a command for estimating two-part models

Thanks to Kit Baum, -tpm-, a module for estimating two-part models for
mixed discrete-continuous outcomes, is now available at SSC. In two part
models, a binary choice model is estimated for the probability of
observing a zero versus positive outcome. Then, conditional on a
positive outcome, an appropriate regression model is estimated for the
positive outcome. -tpm- focuses on continuous outcomes modeled using
-regress- or -glm-. When the outcome is a count variable, such models
are known as hurdle models. Of special note is that -tpm- allows the
user to leverage the capabilities of -predict- and -margins- to
calculate predictions and marginal effects from the combined first- and
second-part models.

-tpm- can be installed from SSC. Type -findit tpm- in your Stata
command line and look for